Change MCSchedModel to be a struct of statically initialized data.

This removes static initializers from the backends which generate this data, and also makes this struct match the other Tablegen generated structs in behaviour

Reviewed by Andy Trick and Chandler C

llvm-svn: 216919
diff --git a/llvm/lib/CodeGen/TargetInstrInfo.cpp b/llvm/lib/CodeGen/TargetInstrInfo.cpp
index 24141af..277073f 100644
--- a/llvm/lib/CodeGen/TargetInstrInfo.cpp
+++ b/llvm/lib/CodeGen/TargetInstrInfo.cpp
@@ -746,14 +746,14 @@
 }
 
 /// Return the default expected latency for a def based on it's opcode.
-unsigned TargetInstrInfo::defaultDefLatency(const MCSchedModel *SchedModel,
+unsigned TargetInstrInfo::defaultDefLatency(const MCSchedModel &SchedModel,
                                             const MachineInstr *DefMI) const {
   if (DefMI->isTransient())
     return 0;
   if (DefMI->mayLoad())
-    return SchedModel->LoadLatency;
+    return SchedModel.LoadLatency;
   if (isHighLatencyDef(DefMI->getOpcode()))
-    return SchedModel->HighLatency;
+    return SchedModel.HighLatency;
   return 1;
 }